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Knowing this, researchers believe they would be able to use liquid eye drops to manipulate the messages being sent by these cells to the brain and help alleviate symptoms experienced by those with flight-induced jet lag or those working night shifts.

Ludwig said: “Studies in the future which alter vasopressin signalling through the eye could lead to developing eye drops to get rid of jet lag, but we are still a long way off from this.”

Long-term sleep disruption is well documented as a cause of health problems, including gastrointestinal and cardiovascular diseases, depression and increased risk of cancer.